JPH0533765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tilting lens that has a lens shutter and can be tilted, and in particular, in any tilted state, the lens shutter can be used to charge and release from the camera body side. This invention relates to a tilt lens with a lens shutter that allows the lens to be moved.

[Conventional technology]

Most medium and large format cameras using Brownie film have a lens shutter rather than a focal plane shutter due to the impact and noise associated with shutter operation and the synchronization time of a strobe.

In addition, with medium- and large-format cameras, tilted subjects can be sharply photographed with the aperture open by tilting or swinging (hereinafter collectively referred to as "tailing"), in which the optical axis of the photographing lens is tilted vertically with respect to the screen. There are many cases where a so-called tilt function is required.

Conventionally, cameras that have a tilt mechanism such as a tilt mechanism and that allow the built-in lens shutter to be charged and released from the camera body include:
It is known that a lens barrel is provided with a tail mechanism, and a plurality of motion transmitting means such as a plurality of universal joints are provided inside the lens barrel (for example, US Pat. No. 4,229,094).

[Problem that the invention seeks to solve]

However, in the case of such a conventional tilt lens with a lens shutter, a universal joint that connects the shutter drive member on the camera body side and the shutter side interlocking member on the lens shutter side must be provided outside the lens optical path, so the lens barrel As they became larger and heavier, their structures became more complex, and there were problems with the durability of interlocking parts.

This invention attempts to solve these problems.

[Means for solving problems]

Therefore, the tilt lens with lens shutter according to the present invention has a main body side interlocking member which is rotatably attached to the lens barrel base and moves together with the shutter drive member on the camera body side, and a predetermined angle around the tilt axis of the lens barrel base. The shutter-side interlocking member, which is rotatably attached to the rotatable lens barrel tail section and moves simultaneously with the shutter operating member of the lens shutter, is connected to the
They are connected by two U-shaped connecting pieces that face each other 180 degrees apart and extend outward in parallel to the tail direction.

[Effect]

With the above configuration, the two U-shaped connecting pieces have almost the same curvature in the non-tailed state, but in the tilted state, one has a large curvature and the other has a small curvature, but In either case, these connecting pieces do not deform in the rotational direction of the main body side and shutter side interlocking members, and the rotation of one of the two interlocking members is transmitted to the other at an equal angle.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the schematic structure of an embodiment in which the present invention is applied to a tilt lens with a lens shutter that can be shifted and tilted in all directions will be explained with reference to FIG. 2, the lens barrel fixing part 5 is fixed to the bayonet 4 of the camera body 3; The lens barrel rotating section 6 is rotatable by a total of 180 degrees, and the lens barrel rotating section 6 is slidably attached to the lens barrel rotating section 6 perpendicular to the lens optical axis L, and is parallelly moved a predetermined distance as shown by arrow B around the origin. a lens shutter 9 which is swingably mounted on a tilt shaft 8 of the lens barrel shift section 7, and a photographic lens 1 incorporated in this lens shutter.
0 built-in, the lens optical axis L can be tilted in the same plane as the predetermined angle shift direction as shown by the arrow C centering on the origin, and a light shielding member 11 is provided between the lens barrel shift section 7 and the lens barrel shift section 7. Sliding lens barrel tail section 12
By combining these, tilting in all directions is possible.

Here, considering only the tail interlocking section which is the subject of the present invention, the lens barrel shift section 7 corresponds to the lens barrel base with respect to the lens barrel tail section 12.

On the other hand, the drive shaft 13 on the camera body 3 side is connected to the shutter drive member 16 via a margin angle spring 14 and a pinion 15 that absorb rotational force during overcharge, and is rotatably provided inside the lens barrel fixing part 5. coupled to the connecting pin 18 of the connected connecting ring 17,
By rotating in the directions of arrows E and F, the lens shutter 9 is charged and released via the rotating section interlocking means R, the shift section interlocking means S, and the tail section interlocking means T.

Next, specific examples of these interlocking means will be explained in detail with reference to FIGS. 1 to 3. For convenience of illustration, the positional relationship between Figures 1 and 2 does not necessarily correspond, and Figures 1 and 3 show the lengths of members extending in the optical axis direction greatly enlarged. ing.

A shutter drive member 1 on the camera body side is inserted into the lens barrel fixing part 5 (FIG. 2) via a connecting pin 18.
The already mentioned connecting ring 17, which moves together with the ball bearing 2, is integrally fixed to the rotary cylinder 19, and the ball bearing 2
The outer periphery of the rotary seat 21, which is integral with the mount 1, is rotated through the mount 1.

Two clutch pawls 2 are provided on the outer periphery of the rotating cylinder 19.
Clutch tubes 22 having 2a are rotated 90 degrees (total 180 degrees) in opposite directions around the optical axis L, centering on the origin.
The clutch pawl 22a is rotatable and slidable within a predetermined range in the optical axis direction, and the clutch pawl 22a normally fits loosely into the arc-shaped elongated hole 17a of the connecting ring 17 and moves together in the rotational direction. The rotation seat 2 protrudes from the elongated hole 17a by moving toward the rear (the camera body side is referred to as "backward" and the subject side is referred to as "front").
1, thereby preventing rotation of the clutch cylinder 22.

A clutch pin 23 is installed facing forward in the clutch cylinder 22, and a flange 24a of a clutch actuating plate 24 that slides in the optical axis direction is loosely fitted into a circumferential groove 22c provided in an outer circumferential step 22b. , clutch tube 22
They are designed to be able to rotate relative to each other and move together in the optical axis direction.

The clutch actuating plate 24 is slidably attached to the lens barrel rotating part 6 in the optical axis direction by a guide part (not shown), and its front end part 24b has a T-shape, and two guide pins 25 are implanted therein. This guide pin 25 is slidably and loosely fitted by a spring 26 into a cam groove 27a of a clutch operating plate 27 having leftward movement.

A clutch operating knob 28 that protrudes outside the lens barrel is attached to the rising portion 27b of the clutch operating plate 27, and movement of the clutch operating knob 28 in a direction perpendicular to the optical axis L causes the clutch operating plate 24 to move in the optical axis direction. do.

The clutch actuating plate 24 further includes a rising portion 24c.
and a rising portion 24d, and a falling portion 24c.
is a rotation locking ring 2 fixed to the lens barrel fixing part 5.
The falling portion 24d is rotatably attached to the front outer circumference of the rotary tube 19. It can be freely engaged with and detached from the outer peripheral notch 30a of the clutch ring 30, which is an interlocking member on the side of the lens barrel rotating section 6.

Further, a cutout groove 29b provided on the outer circumferential portion of the rotation locking ring 29 regulates the rotational position of the lens barrel rotating portion 6 in correspondence with the locking groove 29a.

The clutch ring 30 is provided with the same number of clutch grooves 30b along a semicircumference at the same intervals as the locking grooves 29a of the rotary locking ring 29 on the inner circumference of the clutch ring 30. As a result, the clutch pin 23 engages and disengages from one of the clutch grooves 30b.

The lens barrel rotating section 6 has a linear guide section 31 (Fig. 2).
The lens barrel shifter 7 is mounted so as to be slidable a predetermined distance from the origin shown perpendicular to the optical axis L, and a shift screw 33 is rotatably attached to a screw base plate 32 protruding from the lens barrel rotating portion 6. By screwing the shift screw 33 into a threaded part (not shown) provided on the lens barrel shift part 7 and rotating the shift knob 34 which is integrated with the shift screw 33, the lens barrel shift part 7 can be moved to the lens barrel. It moves relative to the rotating part 6 in a direction perpendicular to the optical axis L.

A shift gear 35 is integrally fixed to this shift screw 33, and this shift gear 35 meshes with a shift interlocking gear 36 having the same diameter.

The shift interlocking gear 36 is fixed to a shift interlocking shaft 38 that is pivotally supported by an interlocking screw base plate 37 that is integral with the screw base plate 32, and is elongated and extends through the lens barrel rotating section 6 and has teeth parallel to the axial direction. It is integrated with the shift interlocking pinion 39. In addition, in FIG. 1, the intermediate portion of this shift interlocking pinion 39 is omitted from illustration.

A moving frame 40 is slidably provided in a guide path (not shown) of the lens barrel rotating section 6 in parallel with the shift interlocking pinion 39, and a moving frame screw having a reverse thread of the same pitch as the shift screw 33 is provided on the moving frame 40. 41 is fixedly fixed in parallel to the shift screw 33, and a shift co-movement gear 42 which meshes with the shift interlocking pinion 39 and has the same diameter as the shift interlocking pinion 39 is screwed onto this moving frame screw 41.
A gear frame 43 is provided which rotatably holds this shift co-moving gear 42 and moves in the longitudinal direction of the movable frame screw 41 together with the shift co-moving gear 42. The frame 43 is configured to move.

The moving frame 40 has a moving frame pin 44 parallel to the optical axis L.
is implanted toward the rear, and its tip is loosely fitted into the radial groove 30c of the clutch ring 30, and the gear frame pin 45, which is parallel to the optical axis L, is similarly installed in the gear frame 43 in the forward direction. The distal end thereof is loosely fitted into a groove 46a having the same phase as the groove 30c of the shift interlocking ring 46, which is a main body side interlocking member rotatably provided on the lens barrel shift section 7, and does not shift. In the illustrated state, the moving frame pin 44 and the gear frame pin 45 are on the same line.

Shift interlocking ring 46 which is a main body side interlocking member
and a tail interlocking ring 4 which is a shutter side interlocking member rotatably attached to the lens barrel tail section 12.
9 are connected to each other by connecting pieces 55, 55 made of two U-shaped elastic metal plates (plate springs). The connecting position is selected so that it extends outward parallel to the tail direction, thereby minimizing the deflection of the connecting pieces 55, 55 when both the shift and tail interlocking rings 46, 49 rotate.

A shutter driving piece 49a is formed toward the front of the tail linking ring 49, and this shutter driving piece 49a engages with a notch 54a of a shutter operating ring 54 that rotates on the rear surface of the shutter 9, so that the shutter 9 can be charged and It is starting to be released.

Next, the operation of this embodiment will be explained.

1 and 2 show the shutter charging state at the origin without rotation, shifting, or tilting, and the central axis of each interlocking member 30, 46, 49 coincides with the optical axis L.

To rotate the lens barrel rotating section 6 (FIG. 2) from this state, first push the clutch operation knob 28 onto the spring 2.
6 in the direction of arrow G in FIG. 1 to move the clutch actuating plate 24 rearward in the optical axis direction.

As a result, the flange 24 of the clutch actuating plate 24
Since a causes the clutch cylinder 22 to retreat a predetermined distance,
The clutch pawl 22a is connected to the elongated hole 17a of the connecting ring 17.
The clutch pin 2 protrudes from the shaft and engages with the clutch groove 21a of the rotating seat 21, preventing the clutch cylinder 22 and the connecting ring 17 from rotating relative to the lens barrel fixing part.
3 and the clutch groove 30b are disengaged.

At the same time, the falling portion 24d of the clutch actuating plate 24
is engaged with the notch 30a of the clutch ring 30, the relative rotation between the clutch ring 30 and the lens barrel rotation part 6 is prevented, and the rising part 24c is disengaged from the locking groove 29a of the rotation locking ring 29. The lens barrel rotating section 6 becomes rotatable.

In this state, the lens barrel rotating section 6 is rotated in a required direction at a required angle relative to the lens barrel fixed section 5, and when the clutch operating knob 28 is released from the position where it is clicked into the rotation locking ring 29, the clutch operating knob 28 is released. 27
Since the clutch actuating plate 24 moves in the direction opposite to the arrow G due to the restoring force of the spring 26, the guide pin 25 of the clutch actuating plate 24 is driven by the cam groove 27a and moves forward.

As a result, the flange 24a of the clutch actuating plate 24
The clutch cylinder 22 that moves simultaneously moves forward, and the clutch pin 23 is connected to the corresponding clutch groove 30b of the clutch ring 30, and the clutch pawl 22a is disengaged from the clutch groove 21a of the rotary seat 21 and is inserted into the long hole of the connecting ring 17. It will be in a state where it engages only with 17a.

In this state, the movement of the clutch tube 22 in the optical axis direction is perpendicular to the clutch operation plate 27.
In addition, since the direction is changed via the cam groove 27a, when the clutch operation plate 27 is stopped, the movement of the clutch cylinder 22 in the optical axis direction is also stopped, and the heavy load of the shutter charge causes the clutch pin 23 to move into the clutch groove. There is no getting out of 30b.

Furthermore, the rising portion 24c of the clutch actuating plate 24
is fitted into the locking groove 29a of the rotation locking ring 29 to prevent the rotation of the lens barrel rotating portion 6, and the falling portion 2
4d is removed from the notch 30a of the clutch ring 30, and the clutch ring 30 becomes rotatable.

Next, in order to shift the lens barrel shift portion 7, it is sufficient to rotate the shift knob 34 which is integrated with the shift screw 33, and the lens barrel shift portion 7 is moved to the linear guide portion 31.
, and moves linearly in a direction perpendicular to the optical axis L with respect to the lens barrel rotating section 6.

The rotation of the shift knob 34 causes the rotation of the shift gear 35, which is integrated with the shift knob 34, to cause the shift gear 36 to rotate.
The shift interlocking pinion 39, which is integral with the shift interlocking shaft 38, rotates in the opposite direction to the shift screw 33, and the shift synchronizing gear 42, which meshes with the shift interlocking pinion 39, rotates in the same direction as the shift screw 33.

Since the shift co-movement gear 42 is screwed into a moving frame screw 41 consisting of a reverse thread of the same pitch as the shift screw 33, the shift co-movement gear 42 and the gear frame 43 move together with the movement of the lens barrel shift section 7. and move.

To perform the tilt operation, the lens barrel tail section 12 can be rotated in a desired direction relative to the lens barrel shift section 7 about the tilt axis 8 (Fig. 2) against frictional resistance. 49 and the shift interlocking ring 46 are lost, but in this case, the two connecting pieces 55 only have a larger curvature of one U-shaped portion and a smaller curvature of the other, as shown in FIG. This makes tailing operation easy.

This connecting piece 55 is connected to the shift interlocking ring 4.
6 does not deform in the direction of rotation, the rotation is transmitted to the tail interlocking ring 49 at an equal angle.

Now, when the shutter drive member 16 is rotated in the direction of arrow F by the release operation on the camera body side from the shutter charge state at the origin shown in FIG. 17. The clutch ring 30 moves together via the clutch cylinder 22.

As the clutch ring 30 rotates, the movable frame pin 44 is driven by its radial groove 30c to the first position.
Since it moves to the left in the figure, the moving frame 40 moves to the left together with the shift synchronizing gear 42 and the gear frame 43, and the gear frame pin 4
5, the shift interlocking ring 46 is rotated counterclockwise through the same angle as the clutch ring 30, and this rotation also rotates the tail interlocking ring 49 in the same direction and at the same angle, and the shutter driving piece 49a is rotated counterclockwise through the shutter operating ring 54 of the lens shutter 9. The shutter operates by rotating the same angle in the same direction.

When the shutter drive member 16 is rotated in the direction of arrow E in FIG. 1 from the shutter release state by a winding operation on the camera body side, the shutter is charged in the completely opposite path to that described above.

Here, when the lens barrel rotating section 6 is rotated from the state shown in FIG. 1, the coupling ring 17 and the clutch ring 30 only rotate integrally in a relatively rotated state, so that the interlocking between them is It is exactly the same as in the original position.

In addition, when the lens barrel shift section 7 is shifted,
The center axes of the clutch ring 30 and the shift linking ring 46 are misaligned, and the movable frame pin 44 and gear frame pin 45 are only moved in parallel by the amount of the shift of the center axes.
0 and the shift interlocking ring 46 via the gear frame 43
also rotate in the same direction and at the same angle.

Furthermore, even in the state shown in FIG. 3 in which the lens barrel tail section 12 is tilted, the rotation of the shift coupling ring 46 causes the tilt interlocking ring 49 to rotate.
The shutter drive member 16 on the camera body side moves at the same time, so even in any tilt position combining these
The rotation is directly transmitted to the shutter operating ring 54 on the lens shutter side, so that charging and releasing operations of the shutter are performed reliably.

Note that the play and deflection of each part of these interlocking mechanisms can be easily absorbed by appropriately selecting the margin angle of the shutter drive section.

[Effect of idea]

As described above, the tilting lens with a lens shutter according to the present invention includes a main body side interlocking member that is rotatably attached to the base of the lens barrel and moves together with the shutter drive member of the camera body, and a tilt axis that moves around the tilt axis of the base of the lens barrel. The shutter-side interlocking member, which is rotatably attached to the lens barrel tail part that can be rotated by a predetermined angle, and the shutter-side interlocking member that moves together with the shutter operating member, is a U-shaped connection having two elastic plates facing each other and separated by 180 degrees. Since the lenses are connected by one piece, the structure is extremely simple, there is no risk of failure, and the lens barrel can be made smaller and lighter, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a side view showing a part of the lens barrel in section, and FIG. Perspective view of main parts shown, No. 4
The figure is also an explanatory diagram schematically showing the overall configuration. 3... Camera body, 5... Lens barrel fixing part, 6...
Lens barrel rotation part, 7... Lens barrel shift part (lens barrel base),
9...Lens shutter, 10...Photographing lens, 1
2... Lens barrel tail section, 16... Shutter drive member, 46... Shift interlocking ring (body side interlocking member), 49... Tail interlocking ring (shutter side interlocking member), 55... Connection piece, T... Tail unit interlocking means, L...optical axis.

Claims (1)

[Scope of Claims] 1. A tilting lens with a lens shutter in which the lens barrel tail portion is rotatable by a predetermined angle around the tail axis of the lens barrel base, which is rotatably mounted on the lens barrel base and driven by a shutter on the camera body side. a main body side interlocking member that moves together with the lens shutter member; a shutter side interlocking member that is rotatably attached to the lens barrel tail portion and moves together with the lens shutter operating member; and a connection between the main body side interlocking member and the shutter side interlocking member. and a tail section interlocking means consisting of two elastic U-shaped connecting pieces, the two U-shaped connecting pieces facing each other at 180 degrees apart, and extending outward in parallel to the tail direction. Aorelins with lens shutters that are characterized by their protruding edges.